Mold for framing electrodes.



Patented May 2|, 190|.

R. J. GLcHEn. MOLD FOR FRAMING ELEGTRDES.

(Application filed June 28, 1900.) (No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT EEICE.

ROBERT JAOOBGLOHEE, OE OHAELOTTENBURG, GERMANY.

MOLD FOR FRAMING ELECTRODES.

SPECIFIcATIoN forming part of Letters Patent Neem/107, dated May 21, 190i.

Application filed June Z8, 1900.

To all whom, it may concern.:

Be it known that I, ROBERT JACOB GL- OHEi=L,engineer, a subject of the King of Prussia, German Emperor, residing at the city of Charlottenburg, near Berlin, in the Kingdom of Prussia, German Empire, have invented certain new and useful vImprovements in Molds for Framing Electrodes of Thin Lead Strips, of which ythe following is a full, clear, and exact description.

The present invention relates to a process for providing electrodes made of thin strips of lead placed alongside or over one another, with lead rims or frames cast around them.

In the American Patent Specifications Nos. 612,649 and 624,513 electrodes are described which are made of a single strip of lead having a rim cast around it ina mold. In this arrangement the lead strips are placed in the mold and have to be held in position during the casting by means of projecting ribs or like arrangements. The accurate adjustment of t-he single strips in the mold requires much time and specially-experienced workmen, so that this method of construction is very complicated and costly. The holding of the separate strips firm by means of projecting ribs or the like necessitates the use of proportionately thick lead strips, as thin strips arranged parallel at certain distances apart would become too much distorted by the means necessary for holding them fast. To Obviate the inconveniences and defects according to the present invention, special core'frames are employed, in which the thin strips or plates of lead are superposed in layers before the casting and separated from one another by rather shorter strips of paper or the like. 'lhe strips or plates can be placed in layers iu the core-frames by hand or by mechanism. The core-frame, filled with the strips of lead and paper, is closed by means of a suitablelid. Only the ends of the lead plates project slightly over the sides of the core-frame, whereas the strips of paper or the like are cut even with the sides. According to the size of the electrode to be made a nulnber of coreframes are arranged as cores at a suitable distance apart in a casting-mold, as is done with cores in the ordinary process of core-casting. These core-frames have then lead poured around them forthe frame. The molten lead Serial No. 21,992, (No model.)

consequently penetrates into the spaces be-V tween the lead plates projecting from the frames, and consequently incloses the ends thereof on all sides and partiallyfnses them, so that all the lead plates are intimately connected with the frame cast around them. During the aforesaid casting around the lead plates the strips of paper prevent the further penetration of the molten lead and at the same time assure the requisite distance apart of the lead plates.

For the better comprehension of the invention the new casting process is illustrated in the accompanying drawings, in which- Figure l shows a coreframe filled. Fig. 2 is an enlarged section on the line A B of Fig. l. Fig. 3 is a plan view of Fig. 1. in elevation an electrode constructed by the use of twelve core-frames. Fig. 5 is a section on the line C D of Fig. 4. Fig. 6 is a View of one-half of the mold with six inserted coreframes, while the other six core-frames are omitted to illustrate the casting-plate itself. Fig. '7 is a vertical section through the mold on the line E F, Fig. 6.

The lead strips c are superposed in layers alternately, with the strips b of easily destructible material (preferably paper) in the core-frame. The core-frame consists of the *parts c and d, of which c forms the sides.

,and d the bottom andtop. The parts c and d are formed of suitable metal-for instance,

steelY Or iron -and t easily and interchangeably int-o one another, the lugs or pins c of the bottom and top engaging in slots of the sides. The pins e therefore serve, on the one hand, for joining the core-frames together,

and, on the other h-and, are likewise intended to keep the core-frames fixed in their ap' Fig. 4 shows' IOO of the core-frames inserted therein, as the strips of paper or the like are of the exact length of the sides. As soon as the frame has set the mold is opened and the coreframes taken out, so that only the lead plates surrounded by the lead frame g remain behind. By drawing out the parts cl the empty spaces h between the plates a and the frame g are formed. These intermediate spaces 7L present the advantage of allowing the lead plates room for expansion during the formation or charging.

In order to remove the strips of paper still remaining between the lead plates, the electrode is immersed in a suitable corrosive or solvent medium, such as sulfuric acid or the like. If the electrode is then allowed to lie exposed to the air, the paper will be completely destroyed after some time. The process of destruction will be accelerated by drying the electrode in a warm place.

By the process described almost any desired increase of the surfaces of the electrode can be produced, as it is only necessary to suitably select the thickness of the strips of lead and paper or the like. It is a further valuable advantage of this new process that electrodes with differently-sized-?l. e., differently-divided-surfaces can be formed by means of the same casting-mold.

I claim- The combination of tWo casting-plates having recesses 7l, said plates placed on each other with a number of core-frames located between them, which frames consist of side parts c and intermediate end parts d, one end part d forming` the bottom and the other the top of the frame, said sides c having the shoulders or projections e engaging the openings /L' of the casting-plates and thus holding the core-frames in their correct position between the casting-plates, substan tially as described.

Iu Witness whereof I have hereunto set my hand in presence of two witnesses.

ROBERT JACOB GLGHER.

Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

